부산대학교 도서관

Paper-based sensors have emerged as a viable and cost-effective alternative to complex and expensive sensing devices. This study developed a paper-based electronic sensor for detecting ammonia by in-situ synthesizing the emeraldine state of polyaniline (PANi) within a Whatman filter paper matrix. The in-situ polymerization of PANi within the paper matrix resulted in a uniform green-colored PANi coating on the paper surface. Scanning electron microscopy (SEM) studies showed well-distributed rod-shaped PANi molecules on the paper surface. The ammonia paper sensor revealed increased resistance with increasing concentrations of gaseous ammonia. Optimal stoichiometric concentrations of HCl and aniline were determined to achieve a paper sensor with rapid response and recovery times. The selectivity of the paper sensor for ammonia was tested against various volatile organic compounds and moisture, exhibiting a selective response specifically to ammonia among the tested chemicals.Graphical Abstract: